The China Mobile, Huawei, and ZTE BNG Simple Control and User Plane Separation Protocol (S-CUSP)
draft-chz-simple-cu-separation-bng-protocol-04

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Last updated 2019-08-10
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INTERNET-DRAFT                                                     S. Hu
Intended status: Informational                              China Mobile
                                                             D. Eastlake
                                                  Futurewei Technologies
                                                                  F. Qin
                                                            China Mobile
                                                                 T. Chua
                                            Singapore Telecommunications
                                                                D. Huang
                                                                     ZTE
Expires: February 9, 2020                                 August 10, 2019

                 The China Mobile, Huawei, and ZTE BNG
       Simple Control and User Plane Separation Protocol (S-CUSP)
             draft-chz-simple-cu-separation-bng-protocol-04

Abstract

   To support Control Plane (CP) and User Plane (UP) Separation (CUPS)
   for fixed network Broadband Network Gateway (BNG) service providers,
   China Mobile, Huawei Technologies, and ZTE have developed a simple
   CUPS control channel Protocol (S-CUSP).

   This document is not an IETF standard and does not have IETF
   consensus.  It is presented here to make the S-CUSP specification
   conveniently available to the Internet community to enable diagnosis
   and interoperability.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Distribution of this document is unlimited. Comments should be sent
   to the authors.

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   and may be updated, replaced, or obsoleted by other documents at any
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Hu, et al                                                       [Page 1]
INTERNET-DRAFT                                           Simple BNG CUSP

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Hu, et al                                                       [Page 2]
INTERNET-DRAFT                                           Simple BNG CUSP

Table of Contents

      1.  Introduction...........................................6

      2.  Terminology............................................7
        2.1.  Implementation Requirement Keywords................7
        2.2.  Terms..............................................7

      3.  BNG CUPS Overview.....................................10
        3.1.  BNG CUPS Motivation...............................10
        3.2.  BNG CUPS Architecture Overview....................10
        3.3.  BNG CUPS Interfaces...............................12
        3.3.1.  Service Interface...............................13
        3.3.2.  Control Interface...............................14
        3.3.3.  Management Interface............................14
        3.4.  BNG CUPS Procedure Overview.......................14

      4.  S-CUSP Protocol Overview..............................18
        4.1.  Control Channel Related Procedures................18
        4.1.1.  S-CUSP Session Establishment....................18
        4.1.2.  Keep Alive......................................19
        4.2.  Node Related Procedures...........................20
        4.2.1.  UP Resource Report..............................20
        4.2.2.  Update BAS Function on Access Interface.........21
        4.2.3.  Update Network Routing..........................21
        4.2.4.  CGN Public IP Address Allocation................22
        4.2.5.  Data Synchronization between the CP and UP......23
        4.3.  Subscriber Session Related Procedures.............24
        4.3.1.  Create Subscriber Session.......................25
        4.3.2.  Update Subscriber Session.......................26
        4.3.3.  Delete Subscriber Session.......................27
        4.3.4.  Subscriber Session Events Report................27

      5.  S-CUSP Call Flows.....................................29
        5.1.  IPoE..............................................29
        5.1.1.  DHCPv4 Access...................................29
        5.1.2.  DHCPv6 Access...................................30
        5.1.3.  IPv6 SLAAC Access...............................32
        5.1.4.  DHCPv6 + SLAAC Access...........................33
        5.1.5.  DHCP Dual Stack Access..........................35
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